Spinal Cord And Hindbrain Flashcards
Where does the spinal cord proper extend to and from ?
From the foramen magnum to the 1st/2nd lumbar vertebrae
Which regions of the cross section of the spinal cord have a larger ventral horn ?
The cervical and lumbar regions have larger ventral horns. The thoracic region has a smaller ventral horn region because it controls the trunk so not many motor neurones are coming out. Thoracic region has a more prominent lateral horn where preganglionic neurones are present
What is lamina 1 called ?
Nucleus posteromarginalis
What is laminae 2 called ?
Substantia gelatinosa
What are laminae 3,4,5 called ?
N.proprius
Where is laminae 7 situated and what is it called ?
Situated in the intermediate horn. It’s called the interomediolateral nucleus. Contains inter neurones to connect different laminae
Where is laminae 9 and what is it called ?
Laminae is in the ventral horn and it’s a motor nucleus
What are the subdivisions of the vertebral column ?
Cervical = 8 Thoracic= 12 Lumbar=5 Sacral=5 Coccygeal
What is present in the grey matter ?
Neuronal cells bodies Dendrites Axons Afferent terminals Glia
What is present in the White matter ?
Axons of ascending and descending tracts
Which laminae are part of the dorsal horn and what are they called ?
Lamina 1- nucleus posteromarginalis
Lamina 2- substantia gelatinosa
Lamina 3,4 and 5 - N.propius
Which lamina is part of the intermediate horn ?
Lamina 7 - intermediolateral nucleus
Which lamina is part of the ventral horn ?
Lamina 9 -motor nucleus
What parts of the body do the motor neurones of the ventral horn control ?
Medial part controls the neck and trunk
Lateral part controls the digits
Organisation is important because descending pathways can be in close proximity but not interfere with each other
What are the spinal meninges ?
Protect the spinal cord
Dura mater = thickest outer layer which attaches to the skull
Arachnoid mater= this is in very close association with the dura mater
Pia mater- this is the layer closest to the spinal cord and it is very thin
Where are the cell bodies of sympathetic preganglionic neurones ?
Thoracic and lumbar levels =thoraco-lumbar
Where are the cell bodies of the parasympathetic preganglionic neurons ?
Sacral levels or BRAINSTEM
Where are the cell bodies are sympathetic post ganglionic neurons found ?
Sympathetic chain
Where are the cell bodies of parasympathetic post ganglionic neurons found ?
Close to the target tissue